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<?php
class MeilisearchHelper
{
    private $host;
    private $apiKey;
    
    public function __construct($host = 'http://127.0.0.1:7700', $apiKey = '')
    {
        $this->host = rtrim($host, '/');
        $this->apiKey = $apiKey;
    }
    
    private function request($method, $path, $data = [])
    {
        $ch = curl_init();
        
        $headers = ['Content-Type: application/json'];
        if ($this->apiKey) {
            $headers[] = "Authorization: Bearer {$this->apiKey}";
        }
        
        curl_setopt_array($ch, [
            CURLOPT_URL => "{$this->host}/{$path}",
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_CUSTOMREQUEST => $method,
            CURLOPT_HTTPHEADER => $headers,
            CURLOPT_POSTFIELDS => $data ? json_encode($data) : null,
        ]);
        
        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        $curlError = curl_error($ch);
        curl_close($ch);
                
        if ($httpCode >= 400 || !$response) {
            echo "HTTP $httpCode\n";
            echo "Response: $response\n";
            echo "Curl Error: $curlError\n";
        }
        
        return json_decode($response, true);
    }
    
    public function addDocuments($index, $documents)
    {
        return $this->request('POST', "indexes/{$index}/documents", $documents);
    }
    
    public function createIndex($index, $primaryKey = 'id')
    {
        return $this->request('POST', 'indexes', ['uid' => $index, 'primaryKey' => $primaryKey]);
    }
    
    public function search(string $index, string $query, array $params = [])
    {
        return $this->request('POST', "indexes/{$index}/search", array_merge(['q' => $query], $params));
    }
    
    public function deleteDocument($index, $id)
    {
        return $this->request('DELETE', "indexes/{$index}/documents/{$id}");
    }
    
    public function deleteAllDocuments($index)
    {
        return $this->request('DELETE', "indexes/{$index}/documents");
    }
    
    public function setSearchableAttributes(string $index, array $attributes)
    {
        return $this->request('PUT', "indexes/{$index}/settings/searchable-attributes", $attributes);
    }
    
    public function setSortableAttributes(string $index, array $attributes)
    {
        return $this->request('PUT', "indexes/{$index}/settings/sortable-attributes", $attributes );
    }
    
    public function setFilterableAttributes(string $index, array $attributes) 
    {
        return $this->request('PUT', "indexes/{$index}/settings/filterable-attributes", $attributes );
    }
    
    public function multiSearch(array $indexes, string $query, array $params = [])
    {
        $queries = [];
        
        foreach ($indexes as $index) {
            $_query = [
                'indexUid' => $index,
                'q' => $query,
                
            ];
            
            if(isset($params['sort']) && !empty($params['sort'])) {
                $_query['sort'] = $params['sort'];
            }
            
            // Add other supported parameters
            if(isset($params['limit'])) {
                $_query['limit'] = $params['limit'];
            }
            if(isset($params['offset'])) {
                $_query['offset'] = $params['offset'];
            }
            if(isset($params['filter'])) {
                $_query['filter'] = $params['filter'];
            }
            if(isset($params['facets'])) {
                $_query['facets'] = $params['facets'];
            }
            if(isset($params['attributesToRetrieve'])) {
                $_query['attributesToRetrieve'] = $params['attributesToRetrieve'];
            }
            if(isset($params['attributesToHighlight'])) {
                $_query['attributesToHighlight'] = $params['attributesToHighlight'];
            }
            
            $queries[] = $_query;
        }
        
        $response = $this->request('POST', 'multi-search', ['queries' => $queries]);
        
        // Merge results from all indexes
        return $this->mergeMultiSearchResults($response);
    }
    
    private function mergeMultiSearchResults($response)
    {
        if (!$response || !isset($response['results'])) {
            return [
                'hits' => [],
                'query' => '',
                'processingTimeMs' => 0,
                'limit' => 0,
                'offset' => 0,
                'estimatedTotalHits' => 0
            ];
        }
        
        $mergedHits = [];
        $totalProcessingTime = 0;
        $totalEstimatedHits = 0;
        $query = '';
        $limit = 0;
        $offset = 0;
        
        foreach ($response['results'] as $result) {
            $indexUid = $result['indexUid'];
            $query = $result['query']; // All queries should be the same
            
            // Add indexUid to each hit
            if (isset($result['hits'])) {
                foreach ($result['hits'] as $hit) {
                    $hit['_indexUid'] = $indexUid;
                    $mergedHits[] = $hit;
                }
            }
            
            // Aggregate metadata
            $totalProcessingTime += $result['processingTimeMs'] ?? 0;
            $totalEstimatedHits += $result['estimatedTotalHits'] ?? 0;
            $limit = max($limit, $result['limit'] ?? 0);
            $offset = max($offset, $result['offset'] ?? 0);
        }
        
        // Optional: Sort merged results by relevance score if available
        if (!empty($mergedHits) && isset($mergedHits[0]['_score'])) {
            usort($mergedHits, function($a, $b) {
                return ($b['_score'] ?? 0) <=> ($a['_score'] ?? 0);
            });
        }
        
        return [
            'hits' => $mergedHits,
            'query' => $query,
            'processingTimeMs' => $totalProcessingTime,
            'limit' => $limit,
            'offset' => $offset,
            'estimatedTotalHits' => $totalEstimatedHits,
            'indexesSearched' => count($response['results'])
        ];
    }
    
    /**
    * Get a document by ID from the specified index
    * 
    * @param string $index The index name
    * @param string|int $documentId The document ID
    * @return array|false Document data or false on error
    */
    public function getDocument($index, $documentId)
    {
        if (empty($index) || !is_string($index)) {
            echo "Error: Index name must be a non-empty string\n";
            return false;
        }
        
        if (empty($documentId) && $documentId !== 0) {
            echo "Error: Document ID must be provided\n";
            return false;
        }
        
        return $this->request('GET', "indexes/{$index}/documents/{$documentId}");
    }
    
    /**
    * Update one document by merging new fields with the existing data.
    *
    * @param string $index The index name
    * @param string|int $documentId The document ID
    * @param array $fieldsToUpdate The fields to update (key => value)
    * @return array|null The API response or null on error
    */
    public function updateDocument(string $index, string $documentId, array $fieldsToUpdate)
    {
        // 1. Obtener el documento actual
        $existing = $this->getDocument($index, $documentId);        
        
        if (!$existing || isset($existing['message'])) {
            Log::write("Error: No se pudo recuperar el documento con ID $documentId.\n. " . json_encode($existing));
            return null;
        }
        Log::write("existing: " . json_encode($existing));
        
        // 2. Mezclar campos nuevos
        foreach ($fieldsToUpdate as $key => $value) {
            $existing[$key] = $value;
        }
        
        // 3. Reenviar el documento completo
        return $this->addDocuments($index, [$existing]);
    }
}